This 15-foot-wide, solar-panel-adorned disc is a floating water purifier, to be plopped into the canals in the Japanese city of Osaka, and into the moat around the city's centerpiece castle. Designed by NTT, these "floating UFOs" can filter about 2400 gallons of water in the 6 hours a day they'll be operational, all the while spewing the newly cleaned and oxygenated water out of a little spout in its back, presumably because these things have the potential to be kind of unsettling, and everything with a blowhole is automatically charming. It's true! Check!

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At night they'll just sort of float along, creepily. They've got batteries for when the sun hides out, but only to power a rack of glowing LED lights. [Asahi via Pink Tentacle—Second image from Mainichi Daily]